Hoist



May 1, 1928. 1,668,284

R. c. OSGOOD HOIST Filed Oct. 8, 1921 lyi l.

13 .2. If g! Patented May 1, 1928. i I

. UNITED STATES 1,668,284 PATENT OFFICE.

ROBERT c. oseoon, or CLABEMONT, NEW namrsmnn, ass'renon To SULLIVAN macnmmw COMPANY, A conronarron or MASSACHUSETTS.

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-Application filed October 8, 1921; Serial No. 506.824.

M invention relates to hoists and to driving motors therefor.

An object of my invention is to provide an improved driving mechanism for hoists. Another object of my invention is to provide an improved hoisting mechanism having a fluid pressure driving motor constructed and arranged in said hoisting mechanism to provide a maximum of efficiency and to permit the supply and exhaust of fluid thereto and therefrom in an. improved manner. Other objects and advantages of my invention will appear in the course of the following specification and apnded claims.

In the, accompanying drawings 1 have shown for purposes of illustration one form which my invention may assume in practice.

In these drawings,

Fig. 1 is a view mainly in central vertical longitudinal section through a hoist embodying the illustrative form of my invention.

Fig. 2 is a view of the drum of the hoist seen from the opposite side from the view in Fig. 1 and with parts broken away to show the construction of the steam supply to the rotors.

Fig. 3 is a transverse sect on through the motor casing on a plane corresponding to the lines 3-3 of Figs. 1 and 2.

In the illustrative form of my invention the same is shown in connection iwith a hoist mounted. upon a generally U -shaped frame 1 having hangers 2 and 3 upstanding at the ends thereof. Within the hanger 2 is journaled a sleeve 4 constituting the support for an internal gear U, which internal gear is provided about its exterior periphery with a bra-king surface 6 with which a brake band 7 controlled by suitable means 8 is adapted to cooperate to hold the gear stationary or to permitrotation thereof as desired. Within the hanger 3 andrinside the sleeve 4 are journaled shafts 9 and 10 which shafts are secured to the ends 11 and 12 of the drum member 13. One end of this drum member (the end opposite the internal gear 5) is provided with a peripheral laterally extending collar 14 with which a brake band 15 controlled by suitable brake applying means 16 cooperates to retard, stop, and release for rotation the drum 13.

The drum 13 ishollow and secured therein is a motor generally indicated by the character 20.- This motor comprises a motor housing proper 21 .which is secured as shown at 22 to the drum 13. i It is surrounded entirely around the periphery thereof with lagging 23 to prevent as far as possible radiation losses and difficulty with condensation of steam within the motor.

The motor further comprises a pair of cylindrical bores 24 and 25 formed within the housing 21 parallel to the axis of the drum 13 and opening into each other as indicated at 26 adjacent the axis of the fill housing 21. Within these bores are rotatable rotors 27 and 28 which are provided upon their peripheries with intermeshing tooth blades 29 which cooperate to form ex panding pockets upon rotation of the rotors and which are so arranged with respect to the inlet hereafter described, that cut-oflt' occurs materially prior to the release of the steam which has been acting in the pockets to cause rotation. Motive fluid is supplied by way of a port 30 to the bores adjacent the point of inception of'the tooth pockets, this steam being supplied from a steam chest or chamber 31 to which fluid is supplied by way of a port 32 which connects with a passageway 33 leading through the shaft 9. It will be noted from Fig 2 that the contour of the steam chamber 31 is generally diamond shape and thatthe same constitutes a-jacket of such proportions as to supply heatto the pockets in which the steam is working under inlet pressure or during expansion, but so disposed that the pockets run out from beneath the outline of the chamber 31. just at the moment when release occurs. It will be noted that release occurs at the moment when the-teeth bounding any given tooth pocket run out of mesh at the ends of the rotors and that exhaust occurs to chamber 34 and 34:" formed beill) l ly

tween'the ends of the rotors and the ends 7 driven from the motor 27 and generally designated 39 cooperates with the internal, gear 5 in the manner explained in the application of one Morris P. Holmes Serial No. 430,211, filed Dec. 13, 1920, to effect driving of the drum 13.

y no

" port 32 into the chamber 31 rotors.

occurs, however, the tooth eally described one. form w From the foregoing description the mode of operation of this mechanism will be readily apparent. The steam which is admitted through the passage 33 passes by way of and thence, by way of inlet port 30, enters the tooth pockets formed between the teeth 29 of the rotors and acts first under full inlet pressure and then expansively to effect rotation of the During the period of admission and expansion the tooth blades in which the pressure is acting are traveling under portions of the wall of the bores 24 and 25 which are live steam'jacketed. \Vhen release pockets have traveled out of roximity to this jacket and accordingly no ieat from the jacket is lost to exhaust steam. It will also be evident that the jacket 23 assists in improving the economy of this mechanism since radiation losses will be reduced by the presence of the insulating material between the steam filled spaces and the atmosphere.

While I have in this a plication specifiliich my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms Withoutdeparting from its spirit or the scope of the appended claims. \Vhat I claim as new and desire to secure by Letters Patent is: I

1. In a hoisting mechanism, a rotatable drum and driving means therefor comprising a steam motor having a casing disposed within and held in immovable relation to said drum, said motor having rotor chain bers disposed parallel to the axis of said drum, and lagging between the exterior of said rotor chambers and said drum.

2. In a hoisting mechanism, a rotatable drum and a driving motor therefor disposed therein including a substantially cylindrical engine casing in which are arranged inlet and exhaust s aces and rotor chambers, said casing being eld in immovable relation to said drum,-and lagging disposed between the exterior of said casing and the interior of said drum.

3. In a hoisting mechanism, a rotatable drum and driving means therefor comprising a motor, said motor including a casing disposed within and held in immovable relationto said drum and having a plurality of rotor chambers, rotors in said chambers having intermeshing tooth blades cooperating upon rotation of said rotors to produce expanding tooth pockets, meansfor jacketing said tooth pockets with live steam during the periods of admission and expansion onl and lagging surrounding said motor ant arranged between the same and said drum.

4. In a hoisting mechanism, a rotatable rope winding drum, driving means therefor comprising a steam motor having a removable casing disposed within said drum, said drum and casing rotating at equiangular rates, and said casing and the wall of said drum forming a substantially annular recess, and lagging arranged in said recess int-he form of a belt surrounding said motor.

5. In a hoisting mechanism, a rotatable rope winding drum, a steam driving motor therefor disposed therein and having a casing adapted to snugly fit the bore of said drum at one transverse rtion in the latter, there being an annular c earance between the drum and easing adjacent said transverse portion, and said drum and easing having portions cooperating to close the other end of said clearance, and lagging in said clearance.

6. In a hoisting mechanism, drum means, adriving motor therefor disposed therein, a removable end member for said motor disposed within said drum and having a laterally offset fluid conducting passage, and an end member for said drum fixed to the latter and having a pasage communicating with said other passage and comprising portions respectively extending along the axis of said drum and radially of the drum.

7. In a hoisting mechanism, a drum, :1 drivingmotor therefor disposed therein, a removable end member for said motor disposed within said drum and having a laterally ofl'set fluid conducting passage, and an end member for said drum fixedly secured to the latter and having a passage communicating with said other passage and v comprising portions extending respectively along the axis of said drum and radially I of the drum, said drum and end members cooperating to form a chamber within which driving mechanism may be disposed.

In testimony whereof I aflix my signature.

ROBERT C. OSGOOD. 

